ARM: EXYNOS: Move the AFTR state function into pm.c

In order to remove depedency on pm code, let's move the 'exynos_enter_aftr'
function into the pm.c file as well as the other helper functions.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 7876ed0..27c9abd 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -69,5 +69,6 @@
 extern void exynos_cluster_power_down(int cluster);
 extern void exynos_cluster_power_up(int cluster);
 extern int  exynos_cluster_power_state(int cluster);
+extern void exynos_enter_aftr(void);
 
 #endif /* __ARCH_ARM_MACH_EXYNOS_COMMON_H */